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课件网) 新概念英语第四册Lesson 2 Spare that spider Lesson 2 Spare that spider 不要伤害蜘蛛 How much of each year do spiders spend killing1 insects Why, you may wonder, should spiders be our friends Because they destroy so many insects, and insects include some of the greatest enemies of the human race. Insects would make it impossible for us to live in the world; they would devour2 all our crops and kill our flocks and herds3, if it were not for the protection we get from insect-eating animals. We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction of the number destroyed by spiders. Moreover, unlike some of the other insect eaters, spiders never do the harm to us or our belongings4. Spiders are not insects, as many people think, nor even nearly related to them. One can tell the difference almost at a glance, for a spider always has eight legs and insect never more than six. How many spiders are engaged in this work no our behalf One authority on spiders made a census5 of the spiders in grass field in the south of England, and he estimated that there were more than 2,250,000 in one acre; that is something like 6,000,000 spiders of different kinds on a football pitch. Spiders are busy for at least half the year in killing insects. It is impossible to make more than the wildest guess at how many they kill, but they are hungry creatures, not content with only three meals a day. It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country. New words and expressions Beast n. 野兽 Census n. 统计数字 Acre n. 英亩 Content adj. 满足的 课堂笔记 New words and expressions 生词短语 flocks and herds 牛群和羊群 ／flCk/ the birds of the same feather flock together.物以类聚，人以群分 you are the same flock.也可指人 herd多指牛群cowherdcowboythrong and crowd swarm6 owe /[U/ vt.感激欠 i owe you.i owe you a big favor. 欠issue obligeindebt appreciate--常用口语词 正式：gratefulthankful beast /bi: st/ n 兽形容人野蛮无比，不能用animal 形容 creature可以指小孩，女人，不用于男性． fraction / ＇frAkF[n/ n.小部分 分数，小数 a fraction of rice will suffice beast /bi: st/ n 兽形容人野蛮无比，不能用animal 形容 creature可以指小孩，女人，不用于男性． fraction / ＇frAkF[n/ n.小部分 分数，小数 a fraction of rice will suffice on one＇s behalf 代表．．．利益 I beat you on your behalf.我打你是为你好 on behalf of somebody /something e.g on behalf of chinese government on behalf of ＝represent authority /C:＇WCriti/ n.权威authorize7批准 authoritative8权威性的 authoritarian9独裁的 －tarian带有这种词缀的词都是坏词 dictator独裁者dictatorial独裁的 authorities １．权威（可单数可复数） ２．当局（复数） census /sens[s/ n.统计数据the fifth national population census.censor10审查 censorious 挑剔的，挑刺的 acre /＇eik[/ n.英亩 １acre＝４０４７square meters football pitch 足球场 ... ...
